When creating an internal DTD, external cannot be nil

In f82dfd2 looks like external, system, and name were made non-nullable.

That was reverted for name in 2852b92

But it seems that it's not now possible to produce an internal DTD, because external cannot be nil?

Sorry, not following. What would you like to change?

Can nil be passed for the value of external in the initializer for ext/libxml/ruby_xml_dtd.c?

Ah. Ok looks like no, it has to be set. Want to create a PR?

I don't really know any C I'm afraid

Allow nil for external and system IDs when creating a DTD

Finally fixed this - will be in the next release.

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